update to toc

Author: julieMSFT

articles/synapse-analytics/toc.yml

@@ -177,7 +177,7 @@
     - name: Overview
       items:
       - name: Synapse SQL architecture
-        href: sql/overview-synapse-sql.md
+        href: sql/overview-architecture.md
       - name: SQL on-demand
         href: sql/on-demand.md
       - name: SQL pool